There are reasons deuces are slow.....one of them is the single master cylinder......lose the brake fluid, lose the brakes.
Does the trailer you're pulling have air brakes that can be hooked to the deuce?
I know it sucks being the toad in the road but that is the nature of the beast.
Have you made sure you are getting the max fuel.....clean filters, no kinked lines, etc.
How is the air cleaner? Diesels need a lot of air and a restricted air cleaner can cause issues.
If you turn the fuel to it and don't know when to back off the throttle you can melt down a piston or otherwise damage the internals of the engine. Thus the need for the pyro.
Transplanting an LDS engine out of a 5 ton can help but they are only about 200 HP so you will still have probs with heavy loads.
This issue has been addressed ad infinitum
.......search is your friend.